Manufacture of camphol esters.



UNITED s'rATns PATENT OFFICE ALBERT VERLEY, OF PARIS, ANDEDOUARD U RBAIN AND ANDRE FEIGE, OF GENTILLY,

. FRANCE. i

MANUFACTURE F CAMPHOL ESTERS.

To all whom'it may concern:

Be t known that we, ALBERT VERLEY, ED- OUARD URBAIN, and AN RE FEIGE, citizens of the Republic of France, and residents, the

first of 27 Rue Notre-Daine de Nazareth, Paris, and the two others of Avenue de la R- publique, Gentilly, Seine, in the said Republic,

. chemists, have invented a new and useful Im- These operations, however, are lon provement in Manufacture of Camphol Esters, of which the followingis a specification.

This invention relates to the manufacture furic acid by adding barium acetate, the

acetic acid could be recovered by distillation. and

costly, and the acid recovered is no onger glacial acetic acid and cannot be used again for the same purpose; on the other hand the large excess of acetic acid used-only serves as a solvent.

- The manufacture of esters ofcamphol such asbornyl' acetate, which forms the subject matter of the present invention, is illustrated bythe following example :An aq ueous sulfuric acid of 6066 per centastrength is first prepared. With 450 parts of'this acid are mixed 100 parts of .camphene, or'of ter )enes containing cam'p'hene, and-100 parts 0 concentrated acetic acid. The mixture is agitated in a mixer for about one hour at a tem- Specification of Letters Patent. Application filed August 20, 1907. Serial No. 889,888.

Patented Dec. 22, 1908.

[ perature' of 20" 30 (1., and. is then poured into a separating apparatus. It forms two cent. camphol acetate containing some traces of borneol, the-lower layer being sulfuric acid and unchanged acetic'acid. After sep atinto the lower layer the'theoretical .p'roporr tion' of acetic acid for 100 parts of camphene, to make it suitable for treating more campercent. By this,pr0cess, therefore, there is used only the; quantity of acid theoretically necessary for the formation of the camphol esters desired, The manufacture of bornyl acet rte has been described merely as an .ex-' ample; formate, thebutyrate, propionate or the like can be prepared in similar manner.

, What We claim as our invention 'is i The process of manufacturing camphol ester, a monobasic acid and sulfuric acid; causing them to react by a mechanical agitation grade; separating the camphol ester by pouring off adding to the prime mixture a quantity of camphene and monobasic acid equal to that which hasfdisappeared; and indefinitely repeating the above operations.

Intestimony, that we claim the foregoing as our invention, we have signed our names August 1907.

ALBERT VERLEY. EDOUARD URBAIN. ANDRE FEIGE.

, j Witnesses:

" DEAN B. Mason,

ALomE FABE.

layers,: the upper of which is about 99 per.

ing the upper layer it suffices to introduce phene. The yield of'this process is about 99 ters,'which consists in, mixing camphe'ne, wa-

at a temperature'of from 20 to 30 centiin presence. of two witnesses, this 7th day of 

